2a2c: Difference between revisions

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[[Image:2a2c.gif|left|200px]]


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==x-ray structure of human N-acetyl galactosamine kinase complexed with Mg-ADP and N-acetyl galactosamine 1-phosphate==
The line below this paragraph, containing "STRUCTURE_2a2c", creates the "Structure Box" on the page.
<StructureSection load='2a2c' size='340' side='right'caption='[[2a2c]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[2a2c]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A2C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2A2C FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.65&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NG1:N-ACETYL-ALPHA-D-GALACTOSAMINE+1-PHOSPHATE'>NG1</scene></td></tr>
{{STRUCTURE_2a2c| PDB=2a2c |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2a2c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2a2c OCA], [https://pdbe.org/2a2c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2a2c RCSB], [https://www.ebi.ac.uk/pdbsum/2a2c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2a2c ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GALK2_HUMAN GALK2_HUMAN] Acts on GalNAc. Also acts as a galactokinase when galactose is present at high concentrations. May be involved in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates.<ref>PMID:8798585</ref> <ref>PMID:16006554</ref>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/a2/2a2c_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2a2c ConSurf].
<div style="clear:both"></div>


'''x-ray structure of human N-acetyl galactosamine kinase complexed with Mg-ADP and N-acetyl galactosamine 1-phosphate'''
==See Also==
 
*[[Cyclophilin 3D structures|Cyclophilin 3D structures]]
 
== References ==
==Overview==
<references/>
Galactokinase plays a key role in normal galactose metabolism by catalyzing the conversion of alpha-d-galactose to galactose 1-phosphate. Within recent years, the three-dimensional structures of human galactokinase and two bacterial forms of the enzyme have been determined. Originally, the gene encoding galactokinase in humans was mapped to chromosome 17. An additional gene, encoding a protein with sequence similarity to galactokinase, was subsequently mapped to chromosome 15. Recent reports have shown that this second gene (GALK2) encodes an enzyme with greater activity against GalNAc than galactose. This enzyme, GalNAc kinase, has been implicated in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates. Here we report the first structural analysis of a GalNAc kinase. The structure of the human enzyme was solved in the presence of MnAMPPNP and GalNAc or MgATP and GalNAc (which resulted in bound products in the active site). The enzyme displays a distinctly bilobal appearance with its active site wedged between the two domains. The N-terminal region is dominated by a seven-stranded mixed beta-sheet, whereas the C-terminal motif contains two layers of anti-parallel beta-sheet. The overall topology displayed by GalNAc kinase places it into the GHMP superfamily of enzymes, which generally function as small molecule kinases. From this investigation, the geometry of the GalNAc kinase active site before and after catalysis has been revealed, and the determinants of substrate specificity have been defined on a molecular level.
__TOC__
 
</StructureSection>
==About this Structure==
2A2C is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A2C OCA].
 
==Reference==
The molecular architecture of human N-acetylgalactosamine kinase., Thoden JB, Holden HM, J Biol Chem. 2005 Sep 23;280(38):32784-91. Epub 2005 Jul 8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16006554 16006554]
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Holden, H M.]]
[[Category: Holden HM]]
[[Category: Thoden, J B.]]
[[Category: Thoden JB]]
[[Category: Galactokinase]]
[[Category: Kinase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 18:30:50 2008''

Latest revision as of 12:10, 14 February 2024

x-ray structure of human N-acetyl galactosamine kinase complexed with Mg-ADP and N-acetyl galactosamine 1-phosphatex-ray structure of human N-acetyl galactosamine kinase complexed with Mg-ADP and N-acetyl galactosamine 1-phosphate

Structural highlights

2a2c is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.65Å
Ligands:, , , ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

GALK2_HUMAN Acts on GalNAc. Also acts as a galactokinase when galactose is present at high concentrations. May be involved in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates.[1] [2]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

References

  1. ↑ Pastuszak I, O'Donnell J, Elbein AD. Identification of the GalNAc kinase amino acid sequence. J Biol Chem. 1996 Sep 27;271(39):23653-6. PMID:8798585
  2. ↑ Thoden JB, Holden HM. The molecular architecture of human N-acetylgalactosamine kinase. J Biol Chem. 2005 Sep 23;280(38):32784-91. Epub 2005 Jul 8. PMID:16006554 doi:10.1074/jbc.M505730200

2a2c, resolution 1.65Å

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